If you don't plan on counting calories than IIFYM is not for you. It basically using an app called myfitnesspal and recording everything you eat, you seem to have a good idea and are getting results so you should be fine. If you start to struggle than I would probably look into it.

Also if you plan to keep it at home I would recommend a power rack, barbell and plates. You can go with basic barbell if you want to keep using the weights you already have.
This is pretty much my current setup and I have fit it into a 9x11 space on my bottom floor, and unfortunately for my girlfriend it's right at the entrance for everyone to see when they walk in